The effect of overloads on threshold and crack closure
โ Scribed by T.H. Topper; M.T. Yu
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 514 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0142-1123
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Ah&act-It has been suggested that the crack closure concept can account for the retardation in crack growth rate following removal of tensile overloads. To test this possibility measurements of effective stress were made on center notched cracked specimens during tests in which tensile overloads wer
## Ahstractxrack closure experiments were performed on 6063-T6 Al-alloy, using COD gauge for various overload ratios (1.67, 1.87 and 2.06) and different prestrains (0, 3 and 6%). On the basis of these experiments some relations are developed. The delay period after application of single overload i
NOMENCLATURE Young's modulus shear modulus elastic constant : 3 -4y plane strain ; 3 -r/l + y plane stress force per unit thickness of plate open end mode I stress intensity factor open end mode II stress intensity factor Poisson's ratio applied uniform tension, 2p/k + 1 distance of concentrated for